Save
OCR GCSE Biology
B1 Cell-Level Systems
B1.4 Photosynthesis
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Ara
Visit profile
Cards (77)
How do most plants obtain their food?
They make their own food by
photosynthesis
View source
What do plants use the food they produce for?
To grow and increase their
biomass
View source
What do plants provide for humans?
Food
,
building materials
,
paper
, and
medicines
View source
What is photosynthesis?
Process by which
plants
make their food
View source
What are the raw materials needed for photosynthesis?
Carbon dioxide
and
water
View source
How does carbon dioxide enter the plant?
It
diffuses
through
stomata
from the air
View source
How does water enter the plant?
It enters the
roots
through
root hair cells
by
osmosis
View source
What do carbon dioxide and water react to produce in photosynthesis?
Glucose and oxygen
View source
What is the word equation for photosynthesis?
Carbon dioxide
+ water →
glucose
+
oxygen
View source
What is the symbol equation for photosynthesis?
6CO₂ + 6H₂O →
C₆H₁₂O₆
+ 6O₂
View source
Where does photosynthesis mainly occur in plants?
In the
leaves
and green stems
View source
Why are leaves and stems green?
They contain
chlorophyll
in their
chloroplasts
View source
What role does light play in photosynthesis?
It transfers energy to
chlorophyll
for reactions
View source
What are the two main stages of photosynthesis?
Light dependent
and
light independent
stages
View source
What happens in Stage 1 of photosynthesis?
Light energy
splits water into
oxygen
and
hydrogen ions
View source
What happens in Stage 2 of photosynthesis?
Carbon dioxide
combines with hydrogen ions to make
glucose
View source
What type of reaction is photosynthesis?
It is an
endothermic
reaction
View source
What does the prefix "photo" in biological terms refer to?
Using
light
to
make
a
change
View source
What is the function of starch in plants?
It provides a store of
energy
View source
What happens to glucose that is not used immediately?
It is converted to
starch
for storage
View source
What other substances can plants make from glucose?
Proteins
,
cellulose
, and fats
View source
What is fructose made from?
Two
glucose
molecules joined together
View source
What is sucrose commonly known as?
Table sugar
View source
Why do plants need to destarch before testing for starch?
To ensure no starch is present in
leaves
View source
How can you test for starch in a leaf?
Use
iodine solution
to check for
blue-black
color
View source
Why is chlorophyll necessary for photosynthesis?
It absorbs light energy needed for
reactions
View source
What happens to the area of a leaf covered by black card during a starch test?
It turns
yellow-brown
, indicating no starch
View source
How can you prove that light is needed for photosynthesis?
Cover part of a leaf and test for
starch
View source
How can you prove that carbon dioxide is needed for photosynthesis?
Use
soda lime
to absorb carbon dioxide
View source
How can you prove that oxygen is produced during photosynthesis?
Collect gas from an aquatic plant and test
View source
What factors affect the rate of photosynthesis?
Light intensity
,
carbon dioxide
, and
temperature
View source
What are limiting factors in photosynthesis?
Conditions that
restrict
the
rate
of
photosynthesis
View source
How do you calculate the rate of photosynthesis?
Rate = amount of
product
/ time
View source
If it takes 2 minutes to produce 1 cm³ of oxygen, what is the rate of photosynthesis?
0.5 cm³
per minute
View source
How does light intensity affect photosynthesis?
Higher light intensity increases the
rate of photosynthesis
View source
What happens to photosynthesis at very low light levels?
Photosynthesis is
limited
or stops
View source
What is the measure of how much photosynthesis occurs in a given time called?
Rate of photosynthesis
View source
How is the rate of photosynthesis calculated?
Rate =
amount
of photosynthesis / time
View source
What are common units for measuring the rate of photosynthesis?
per second
,
per minute
,
per hour
View source
If it took 2 minutes for Elodea to produce 1 cm of oxygen at 2500 lux, what is the rate of photosynthesis?
0.5 cm
per minute
View source
See all 77 cards